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The value of sin^(2)30^(@).cos^(2)45^(...

The value of `sin^(2)30^(@).cos^(2)45^(@)+2tan^(2)30^(@)-sec^(2)60^(@)` is equal to :

A

`-13/12`

B

`-77/24`

C

`-25/12`

D

`-1/12`

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